Notes describing the moderate to severe coastal erosion in San Mateo
County during the 1982-83 El Niño are compiled on twenty-six page-sized
maps at a scale of 1:12,000. The bases for these maps are enlarged portions
of the 7 USGS 7.5' topographic quadrangles that cover the coastal area of
San Mateo County. Notes describing critical erosion are colored red, and
those describing noncritical erosion are colored black. The areas of critical
erosion are summarized separately on a smaller-scale map (see
critical erosion map).